Search results

1

Seasonal variation in heavy metal distribution in the sediments of selected dams in Nasarawa State, Nigeria

100%

Gav B. L., Aremu M. O., Etonihu A. C.

World News of Natural Sciences

|

2018

|

vol. 20

148-159

EN

The study was carried out to ascertain seasonal variation in heavy metal distribution in sediments from Dams located in Nasarawa State, Nigeria. Sediment samples were collected twice each at two different seasons for two years from May to September, 2014 and November-December, 2014 to March, 2015 for wet and dry seasons, respectively. Similarly, sediment samples were collected from May to September, 2015 and November-December, 2015 to March, 2016 for wet and dry seasons, respectively. The samples were then assessed for heavy metal properties, using atomic absorption spectrophotography (AAS). Analysis of variance (ANOVA) was then applied. The mean results of the heavy metal levels showed high values in dry seasons and low values in wet seasons in the two years of the study. Herein, the results of ANOVA revealed significant difference in the heavy metal concentrations between the seasons, dams and years. Our study also indicated that for heavy metals, the levels determined in sediments were within the WHO acceptable standards, except for Pb and Mn. These exceeded the WHO acceptable standards for drinking water. Based on these results, the dam waters are, therefore, polluted and unsuitable for human consumption, except after treatment.

2

Risk assessment of human exposure to heterocyclic aromatic compounds in sediment dwelling biota from Ibeno River Catchment, Southeast, Nigeria

100%

Obieshi P. O., Oyo-ita O. E.

World News of Natural Sciences

|

2023

|

vol. 51

83-97

EN

Biota and associated sediment samples were collected from the Ibeno river catchment and analyzed using the standard methods for investigation of the sources and the distribution of heterocyclic compounds in the area. The lipid content values of the biota varied from 10-29% dry weight (dw; mean = 15.8 + 7.79) in Large crab (LC) and ranged from 5-10% dw (mean = 7.6 + 1.82) in small crab (SC). Also, it ranged from 6-10% dw (mean= 7.6 + 1.52) in small shrimp (SS) and varied from 7-40% dw (mean = 23.6 + 1.47) in large shrimp (LS). High TOC (4.5%) and TIC (2.53%) were found for the associated sediment, and this was because of the silty nature of the sediment, having high adsorption capacity for organic matter. The high extractible organic matter (EOM) value recorded for the associated sediment may be linked to petroleum hydrocarbon discharge into the environment by Exxon Mobil. The biota-sediment accumulation factor (BSAF) values ranged from 0.0029-0.0059 (mean = 0.0047 + 0.00128) for LC and 0.0059-0.0085 (mean = 0.00724+0.001276) for SC. On the other hand, the values ranged from 0.0060-0.0160 (mean = 0.0037 + 0.002787) and 0.0018-0.0084 (mean = 0.0096 + 0.004079) for LS and SS respectively. This low result reviews that the contaminant uptake from the associated sediment by the biota was negligible, hence, the consumers exposed to this biota might not have experienced any serious health risk associated with the consumption of heterocyclic aromatic hydrocarbons. The aromatic fractions from column chromatography would subsequently be subjected to gas chromatography mass spectrometry analysis to identify and quantify the individual heterocyclic aromatic hydrocarbons.

3

Marine Environment Around Iceland: Hydrography, Sediments and First Predictive Models of Icelandic Deep-sea Sediment Characteristics

88%

Ostmann A., Schnurr S., Arbizu P. M.

Polish Polar Research

|

2014

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issue 2

4

Persistent Organic Pollutants (POPs) and Polycyclic Aromatic Hydrocarbons (PAHs) in surface sediments from selected fjords, tidal plains and lakes of the North Spitsbergen

75%

Sapota G., Wojtasik B., Burska D., Nowiński K., Sapota G., Wojtasik B., Burska D., Nowiński K.

Polish Polar Research

|

2009

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vol. 30

|

issue 1

5

PLEISTOCENE DEPOSITS IN THE SOUTHERN EGYPTIAN SAHARA:LITHOSTRATIGRAPHIC RELATIONSHIPS OF SEDIMENTSAND LANDSCAPE DYNAMICS AT BIR TARFAWI

75%

Hill C. L., Schild R.

Studia Quaternaria

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2017

|

vol. 34

6

Factors affecting water quality in degraded sewage receivers – case study of the phosphorus dynamics in the Ner River

75%

Mosiej J., Komorowski H., Karczmarczyk A., Mosiej J., Komorowski H., Karczmarczyk A.

Journal of Water and Land Development

|

2007

|

issue 11

7

Eulalia picta Kinberg, 1866 – tube builder or specialized predator?

75%

Pabis K., Sobczyk R.

Polish Polar Research

|

2017

|

vol. 38

|

issue 4

8

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

75%

Krajewska M., Szymczak-Żyła M., Kowalewska G.

Polish Polar Research

|

2017

|

vol. 38

|

issue 4

9

Multivariate statistical approaches as applied to environmental physics studies

75%

Lovchinov V., Tsakovski S.

Open Physics

|

2006

|

vol. 4

|

issue 2

277-298

EN

The present communication deals with the application of the most important environmetric approaches like cluster analysis, principal components analysis and principal components regression (apportioning models) to environmental systems which are of substantial interest for environmental physics - surface waters, aerosols, and coastal sediments. Using various case studies we identify the latent factors responsible for the data set structure and construct models showing the contribution of each identified source (anthropogenic or natural) to the total measure of the pollution. In this way the information obtained by the monitoring data becomes broader and more intelligent, which help in problem solving in environmental physics.

10

Evaluation of heavy metal contamination in sediments of the Seybouse River, Guelma – Annaba, Algeria

75%

Talbi H., Kachi S.

Journal of Water and Land Development

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2019

|

issue 40

11

Limno-terrestrial diatom flora in two stream valleys near Arctowski Station, King George Island, Antarctica

63%

Noga T., Kochman-Kędziora N., Olech M., Van de Vijver B., Noga T., Kochman-Kędziora N., Olech M., Van de Vijver B.

Polish Polar Research

|

2020

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vol. 41

|

issue 4

12

Ecological Risk Assessment Of Heavy Metals In Sediments Of A Riverine Wetland, Huaihe River Watershed, China

63%

Yuan H., Pan W., Zhu Z., Wei Y., Geng Q., An S.

|

issue 2

231-242

EN

The concentrations of Zn, Cr, Cu, As, Cd, and Pb in sediment cores collected from a representative riverine wetland located in the Huaihe River watershed, China, dramaticlly increased from the bottom to upper layer of the cores. Application of principal component analysis (PCA) and enrichment factor (EF) suggested that heavy metals might primarily have been derived from the inflow of contaminated water from an industrial park and agricultural region. Component 1 of the PCA was dominated by Zn, Cr, Cu, Cd, and Pb, while Component 2 was dominated by As. Metals’ high concentrations and EF values showed that the anthropogenic pollutants have increased sharply in recent years and reflect the continuous development of industry and agriculture in the region of the wetland, with a corresponding dramatic deterioration of the environment due to constant effluent of pollutants. Cd exerted the highest potential ecological risk of individual metals of sediment cores. Additionally, integrated RI values for all metals indicated that sediments possessed low ecological risk from the bottom to about 6 cm depth of the cores, moderate ecological risk from about 5 cm depth upwards, then considerable ecological risk from 4 cm depth to the top layer of the sediment cores, which demonstrates a continuous deterioration of environmental quality in recent years in this region.

Refine search results

Seasonal variation in heavy metal distribution in the sediments of selected dams in Nasarawa State, Nigeria

Risk assessment of human exposure to heterocyclic aromatic compounds in sediment dwelling biota from Ibeno River Catchment, Southeast, Nigeria

Marine Environment Around Iceland: Hydrography, Sediments and First Predictive Models of Icelandic Deep-sea Sediment Characteristics

Persistent Organic Pollutants (POPs) and Polycyclic Aromatic Hydrocarbons (PAHs) in surface sediments from selected fjords, tidal plains and lakes of the North Spitsbergen

PLEISTOCENE DEPOSITS IN THE SOUTHERN EGYPTIAN SAHARA:LITHOSTRATIGRAPHIC RELATIONSHIPS OF SEDIMENTSAND LANDSCAPE DYNAMICS AT BIR TARFAWI

Factors affecting water quality in degraded sewage receivers – case study of the phosphorus dynamics in the Ner River

Eulalia picta Kinberg, 1866 – tube builder or specialized predator?

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

Multivariate statistical approaches as applied to environmental physics studies

Evaluation of heavy metal contamination in sediments of the Seybouse River, Guelma – Annaba, Algeria

Limno-terrestrial diatom flora in two stream valleys near Arctowski Station, King George Island, Antarctica

Ecological Risk Assessment Of Heavy Metals In Sediments Of A Riverine Wetland, Huaihe River Watershed, China